Sundials - World's Oldest Clocks

North American Sundial Society

Oakland  

Sundial 613
State/Province:  California Country:  USA
Dial Type:  Projection Condition:  Excellent
Latitude:   37° 49.2' N Longitude:   122° 10.8' W
Location:
  • Chabot Science Center
    Oakland, California
 
Description:
  • One of Bill Gottesman's unique-design Renaissance dials of cast and structural bronze with a 27 inch diameter helix with a celestial-north aligned axis. Time is told by a focused beam of light that moves around the helix throughout the day. The light beam is reflected from a long cylindrical unsilvered mirror in a structure that supports the helix. A sliding time scale within the helix can be adjusted for EOT and DST and includes longitude correction. Once this scale is adjusted for date, the dial shows civil, or clock, time. The dial base is cast bronze allowing adjustment for latitude and placed on a concrete pedestal.
 
General Information:
  • Owner: Chabot Science Center
  • Designer: Bill Gottesman
  • Builder: Bill Gottesman
  • Construction Date: Donated March, 2002
 
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